Last.



- s. s. CAMERON.

LAST.

APPLIUATION FILED NOV. 1' 7, 1906.

933,821, Patented Sept. 14,1909;

Wins'w 3' SIDNEY S. CAMERON, OF DETRCIT, MICHIGAN.

LAST.

Specification of Letters Patent. Patented Sept. 14:, 1909.

Application filed November 17, 1906. Serial No. 343,844.

To all whom it may concern:

Be it known that I, SIDNEY S. CAMERON, a citizen of the United States ofAmerica, residing at Detroit, in the county of WVayne and State ofMichigan, have invented certain new and useful Improvements in Lasts, ofwhich the following is a specification, reference being had therein tothe accompanying drawings.

This invention relates to improvement in hinged lasts of that kind inwhich the forepart section and the heel section are hinged together by alock hinge which holds the sections in their extended position and canbe unlocked when desired to withdraw the last from the work. In theprior construction, the lock hinges are composed of associated membersand for this reason many misfits result from the use of such hinges onaccount of the difliculty of accurately securing the hinge members inthe sections of the last. Further such lock hinges being more or lessbulky and of cast iron much breakage of lasts was incurred either onaccount of the hinge being weak from cutting away too much of the woodor from the cracking of the cast iron in the heavy operations to whichthe lasts are subjected. It is also difficult in the use of such lockhinges to change the styles or replace broken lasts without makingentire new lasts, while it would effect a considerable saving byreplacing only the forepart section which is the one most affected.

My invention is designed to provide a simple and efficient constructionin which the hinge connection can be more easily and accurately made andto which the other objections stated do not apply.

To this end the invention embodies the construction of the improved lockhinge as hereinafter more fully described with reference to theaccompanying drawings in which Figure 1 is a vertical longitudinalsection of my improved last, Fig. 2 is a side elevation thereof, andFig. 3 is a cross section on line X-X Fig. l.

The last is composed of a fore-part section 1 and a heel section 2 thelatter being integrally formed with two forward projecting hingeknuckles 3 which accurately fit into corresponding recesses in thefore-part section and form a continuous abutment therewith on the bottomside of the last.

The two hinge knuckles are separated in the center by a narrow slit 23which extends rearwardly into the heel section and into this slitengages a hinge plate formed with a corresponding knuckle 4 and having ashank 5 extending into the fore-part section and secured therein bytransverse pins 6 and 7. The knuckle of the hinge plate is pivotallyconnected with the knuckles 3 by a transverse hinge pin 8 which passesthrough from side to side and is fast in the wood.

The heel section is provided with the usual socket ferrule 9 of uniformdiameter for supporting the last upon the jack pin and a coil spring 13confined between it and the heel plate 14.

It will be noted that the edge of the knuckle plate 4 beyond theshoulder 12 is rounded, and that the portion of the dog 10 in advance ofthe pivot 11 is correspondingly in-curved along its inner edge. In thisway, after disengagement of the dog from the shoulder, the slidingengagement of the knuckle plate with the dog as the last is collapsedwill cause practically no further movement of the dog; and for thisreason a short spring may be employed. A slot 15 is formed in the woodof the forepart sec tion for the reception of the forward portion of thedog, and this slot is curved to correspond with the curvature of theknuckle plate, thus providing for the proper reception of the dog with aminimum cutting away of the wood.

The heel and fore-part sections being'cut away as usual at one side ofthe hinge it will be seen that the lastmay be collapsed by engaging itwith a jack pin of sufficient length to press the dog out of engagementwith the locking shoulder of the hinge. To this end the jack pin uponwhich the last is secured may be provided with a removable collaradapted to hold it out of contact with the locking dog while the work iscarried on.

The importance of causing the pivoted detent to project Within the usualjack-spindle socket of uniform diameter is that, with This dog projectssuch construction, a special' pin or spindle for unlocking the detent isunnecessary. The same jack-spindle upon which the last has beensupported throughout the work will perform the operation by simplyremoving the collar or similar spacing device whichv has hithertoprevented its contacting with the detent;

With my construction there is but a small amount of wood to cut away tomake room for the hinge plate and dog, and the metallic parts are simpleand form parts of a strong hinge in which the dog acts as a brace in thesupport of the fore-part when subjected to pressure. I Since thehingemembers are not composed of parts associated together as a lockinghinge independently of the last, the hinge can be fitted to the lastmore accurately than would be otherwise the case. The abut ting facesbetween the two sect-ions interlock with each other and hold them intheir proper relation and being wholly formed by the wood of the lastthey can be accurately fitted together before applying the hinge plate.The hinge plate can then be secured in position first in one part andthen in the other, the holes for thefastening pins being 7 bored throughthe wood and the hinge plate at one operation while the last is held inits proper extended position and the dog 1s then secured 1n properpositlon in a slmilar manner. Thus the hinge is completed by a series ofsimple operations which simplify the construction of such lasts andreduce the number of misfits resulting from the use of lock hingescomposed of associated members.

Having thus'fully described my invention 'cut bodily out of saidadjacent face of the forepart, the sides of the kerf forming guidesbearing against the outer sides of the knuckles, a narrow metal plateembedded in the foresection and extended between the knuckles, a pivotpin passing through the knuckles and plate, the edge of the platebetween the knuckles being substantiallyconcentric with the pin exceptfor a shoulder having a radial edge, a jack spindle socket inserted inthe rear section in the plane of the plate and provided at its inner endwith a deep notch, a dog of thin sheet metal bent in a reverse curve andpivoted between its ends in a narrow slot in the body of the rearsection to vibrate in the plane of the plate with its forward end ridingon the plate margin between the knuckles and having a squared endadapted to abut the plate shoulder and lock the sections in extendedposition, and a spring in the socket in compression between the so'cketbottom and the rear end of the dog which extends through the socketnotch.

In testimony whereof I aflix my signature in presence of two witnesses.

SIDNEY S. CAMERON. WVitnesses V Lnwis E. Fnanonns, (l'r'ro F. BAR'IHEL.

